Daewoo 531X Service Manual page 22

6. Unstable Picture
6-1. Horizontal
Unstable
picture
Is the
pulse of pin 26 of
the IC501
correct?
No
Is the
pulse of pin 28 of
the IC201
correct?
5Vpp
No
Is the
input H.Sync
correct?
No
Trouble in Signal Cable
or 15P D-Sub Connector
Trouble in IC501
Yes
or its ambient
circuit
Yes
Check IC501 and
its ambient circuit
Yes
Check IC201 and
its ambient circuit
20